Berenstein-Zelevinsky triangles, elementary couplings and fusion rules

Abstract

We present a general scheme for describing su(N)_k fusion rules in terms of elementary couplings, using Berenstein-Zelevinsky triangles. A fusion coupling is characterized by its corresponding tensor product coupling (i.e. its Berenstein-Zelevinsky triangle) and the threshold level at which it first appears. We show that a closed expression for this threshold level is encoded in the Berenstein-Zelevinsky triangle and an explicit method to calculate it is presented. In this way a complete solution of su(4)_k fusion rules is obtained.

14 pages

References in corpus (2)

• su(3)k fusion coefficients
• Can fusion coefficients be calculated from the depth rule ?

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